A tibial support of an artificial knee joint, comprising a main tibial support body (100) and a tibial support platform (200), wherein the main tibial support body (100) is wing-shaped, a central axis thereof being vertical to the tibial support platform (200). A plurality of hollow screw holes is provided at the upper part of the main body (100). The tibial support platform (200) is located above the main tibial support body (100). The surface of the tibial support platform (200) is an organic polymer material layer matching a tibial liner. The hollow screw holes in the tibial support are sealed by the polymer material layer. Because a tibial support of an artificial knee joint adopts a high-biocompatibility organic polymer material, physical machining is allowed in an operation, and meanwhile, the surface corrosion of the tibial support is reduced. Hollow screw holes are sealed by means of a polymer material layer, thereby inhibiting joint liquid from entering the holes, and reducing the transportation of particles. Recesses (201) are provided at positions, corresponding to the screw holes, on the polymer surface, thereby aiding in drilling holes and mounting screws in an operation.